One of our customers, Landon Balk, used the uniPulse midi interface to add midi to his Boss DR-55.
He also completely modded his machine and constructed a custom case.
You can purchase the case directly from him: facebook site or website.
This manual shows how to install uniPulse in the Boss DR-55 based on his instructions.
Please read carefully before purchasing the uniPulse mod. If you want this to be done by a tech, get a quote first!